package com.MusicWeb.servlet;

import com.MusicWeb.entity.Column;
import com.MusicWeb.service.ColumnService;
import com.google.gson.Gson;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet("/column")
// todo: 栏目查询接口
//http://localhost:8080/column
public class ColumnServlet extends HttpServlet {
    ColumnService columnService = new ColumnService();

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        List result = columnService.SelectColumn();
        if (result!=null) {
            // 设置返回的数据为json对象
            resp.setContentType("application/json;charset=utf-8");
            // 把实体转换为json，返回给前端
            String str = new Gson().toJson(result);
            resp.getWriter().print(str);
        }
    }
}
